I could have helped him out, to tell the truth, I _____ too busy.
| A．am | B．was | C．have been | D．had been |
________ inthought,healmostranintothecarinfrontofhim．
| A．Losing | B．Havinglost | C．Lost | D．Tolose |
I watched the plane go higher and higher until I lost _____ of it．
| A．view | B．scene | C．vision | D．sight |
I usually take something to read when I travel by train _____I feel bored．
| A．as if | B．so that | C．in case | D．even though |
Out _____, with an apple in his hand．
| A．rushed the boy | B．did the boy rushed |
| C．the boy rushed | D．the boy did rush |
Not until he met with the difficulty _______ the importance of group work．
| A．he realized | B．did he realize | C．realized he | D．he didn’t realize |